leiner



No. 6I6,675. Patented D ec. 27, i898. G. F. KRETZ.

DREDGING MACHINE.

(Application led Nov. 30, 1896.)

2 Sheets-Sheet 2.

(No Model.)

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No. 6|6,677. Patented Dec. 27, |898. M. LEINEH.

PULISHING BRUSH.

(Application led Apr. 20, 189B.)

(No Model.)

'AT HA/EYS.

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of breaking down the shoal-bank progresses the vessel equipped with thescoiuing-dredger is moved upstream and continually kept in contact Withthe surfaces of the Shoal-bank to be operated upon.

In case the stuff being dredged yields unequally to treatmentthrottle-valves z' make an appropriately diminished or increasedpressure possible Awith separate portions of thejets, While theguard-plates 7,3, Figs. 2 and 3, and the scraper Z, Fig. 3, prevent thefalling of Waste and pebbles into the cleansed channel.

The contrivances hitherto known as jetdredgers77 only aim at stirring orfurrowing up muddy bottoms and then leaving everything further to thecurrent. Removal of the Shoal stuff by Water-jets is not provided for bythem.

The dredging apparatus can be placed,

either movable or stationary, on the motorboat or can also be .built inthe boat itselff and can be Worked hydraulically or with compressed air.

That I claim as myinvention, and desire to secure by Letters Patent, is-

Scouring-dred ger specially recognizable by two hydraulic reservoirs coccupying the de? GEORG FRANZ KRETZ.

lVitnesses:

FRIEDRICH SISBAUER, FRED HOFMANN.

